Marine Biology Section Meeting March 8th 2008 Petit Bot

About 10 members met at Petit Bot on a blustery day at the equinoctial spring ( 0.83m) low tide. As the tide was turning we walked straight down to low tide mark and examined the rocks on either side of the beach. We found 6 species of sea anemones: Red and Green Beadlet, Strawberry, Snakelocks, Gem and Daisy. Beadlet Anemones are known by children in Guernsey as "Blood Suckers", this probably saves the anemones from too much disturbance by children playing on the beach. The Daisy Anemones looked like lumps of unappetising brown jelly with stones and shells stuck to them; quite unlike their beautiful mottled tentacles when they are covered with water.

Actinia spp. 29kb
Beadlet Anemones Actinia equina and prasina.
Actinia fragaria 52kb
Strawberry Anemone Actinia fragaria.
Anemonia viridis.
Snakelocks Anemone Anemonia viridis.
Aulactinia verrucosa.
Gem Anemone Aulactinia verrucosa.
Cereus pedunculatus.
Daisy Anemone Cereus pedunculatus.

We found a beautiful green annelid worm, probably Eulalia viridis, crawling on the rocks.

Pedicillina sp
Eulalia sp.

In some places the weeds were plastered with the egg cases of the Netted Dog Whelk Hinia reticulata

Hinia egg capsules
Netted Dog Whelk egg capsules.
Hinia reticulata
Netted Dog Whelk

We identified a few seaweeds,sponges and sea-squirts including:-

Lomentaria articulata
The red seaweed Lomentaria articulata
Himanthalia elongata
The brown seaweed Himanthalia elongata just starting to grow from its buttons
Rhodothamniella floridula
The red seaweed Rhodothamniella floridula binding sand at the edge of the rocks
Grantia compressa
The sponge Grantia compressa
Botryllus schlosseri
The colonial sea-squirt Botryllus schlosseri
Chthalamus sp.
Barnacles Chthalamus sp. pitted by the marine lichen Pyrenocollema halodytes

Fulmars were nesting on the cliff at the east of the beach

Fulmars
Fulmars

Some of the Section on the beach at Petit Bot

Hinia reticulata
Marine Biology Section meeting